90-13645--2 1095
5A-9
LOWER UNIT
2. Place a block of wood, as shown, to prevent pro-
peller from rotating and to protect hands during
removal of nut.
3. Remove nut and pull components from shaft.
19183
a
a - Block of Wood
Draining and Inspecting Gear Housing
Lubricant
WARNING
If gear housing is installed on engine, to avoid
accidental starting, disconnect (and isolate)
spark plug leads from spark plugs before working
near the propeller.
1. With gear housing in normal running position,
place a clean pan under housing and remove the
two vent screws and one fill/drain screw (with
gaskets).
51552
c
a
b
a - Oil Level Screw
b - Fill/Drain Screw
c - Vent Screw
2. Inspect gear lubricant for metal particles (lubri-
cant will have a “metal flake” appearance). Pres-
ence of fine metal particles (resembling powder)
on the drain plug bar magnet indicates normal
wear. The presence of metal chips on the drain
plug bar magnet indicates the need for gear hous-
ing disassembly and component inspection.
3. Note color of gear lubricant. White or cream color
MAY indicate presence of water in lubricant. Gear
lubricant which has been drained from a gear
case recently in operation will have a yellowish
color due to lubricant agitation/aeration. Gear
lube which is mixed with assembly lubricant (Spe-
cial Lube 101 or 2-4-C w/Teflon will also be
creamy white in color. This is normal and should
not be confused with the presence of water. If wa-
ter is supected to be present in gearcase, a pres-
sure check of gearcase should be made (with no
lubricant in gearcase). Gearcase should hold 10
to 12 psi of pressure for 5 minutes without leaking
down. Pouring a portion of the gear lubricant into
a glass jar and allowing the lubricant to settle will
allow any water in the lube to separate and settle
to the bottom of the jar.
4. Presence of water in gear lubricant indicates the
need for disassembly and inspection of oil seals,
seal surfaces, O-rings, water pump gaskets as
well as gear housing components for damage. If
gearcase is rebuilt, gearcase should be pressure
checked before filling with lubricant.
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